Drilling apparatus



Jan. 19 1926.

G. H. GILMAN DRILLING APPARATUS original Filed pril 14, 1915 asheets-sheet 1 Jan. 19, 1926. 1,569,970

G. H. GILMAN DRILLING APPARATUS original Filed April 14, 1915 e.sheets-sheet 2 -uli/vent ov.- Georgefl. ('ilman, y 54.5.

0 3 w n m 5, r M, v

m. m m n .m L P P m A A H. m .M G. m .1 n m .mv WN m6 :2 mw o bm mmm, QS6. hmm Nm mw .l y. w, om mv, n.. .n

@6. .n m /V d NN m m l if ,vH. MWM \\\`b W f m .man @r av., A MWAUMQA NWqb wm mm Si mwm mw ow lummm mm ,www @m mww um A UWM. @n www, w

BW W 9 a t. wg

Jan. 19 1926.

, G. H. GILMAN DRILLING APPARATUS Original Filed April 14 1 1915 8Sheets-Sheet 4 .Izveniowc- 'eowyejl Gili/nan,

MW# .al

Jan. 19 1926. v 1,569,970

G. H. GILMAN BILLING APPARATUS Original Filed April 14, 1915 8sheets-Shut 5 y a /nafraofoasf d 50 Na/ asf.' /vaa 05.5.5 d 50GeorglG/a'Li/nan, l by ,mi f

dit; s.

Jan. 19 1926.

G. H. GILMAN DRILLNG APPARATUS original Filed April 14, 1915 8Sheets-Sheet 6 Inventov:

Qorgel Liimn, win/7M /7%. faja/ Jan. 19, 1926.y

No.6 Pos '9/ y Gl.' H. GILMAN DRILLING APPARATUS Original Filed April14, 1915 8 Sheets--Sheeii 7 /0/ Inventor:

Georqej (man,

by@ y dt/g Jan. 19 1926. 1,569,970

G. H. GILMAN DRILLING APPARATUS original Fild April 14, m15 ssheets-sheet e IYa/'eotoim' i Georg/ej?. Gi/nan,

Patented dan. 19, 1926.

U NITED ASTATES PATENT OFFICE.

GEORGE H. GILMAN, OF BOSTONl MASSACHUSETTS, ASSIGNOR TO SULLIVAN MACHIN-ERY COMPANY, OF BOSTON, MASSACHUSETTS, A `C6121?.RAIIION OF MASSACHU-SETTS.

DRILLING APPARATUS.

Application led April 14, 1915, Serial `1\To..21,43. Renewed November 2,1922. Serial No. 538,646.

To all fui/tom t may concern.'

Be it known that L Grenen H. GILMAN, a citizen of the Uiiited States,and a resident ot Boston, Suffolk County, Massacl'iusetts, have inventedan Improvement in Drilling Apparatus, ot which the followingdescription, in connection with the accompanying drawings, is aspeciiication, like characters on the drawings representing like parts.

This invention relates to feeding mechanisms, and is more particularly,though not exclusively, concerned with a pressure `tluifl impact orpercussive drilling tool, having pressure tiuid means for advancing thetool toward, or retracting it from, its work, and means .torcoordinately controlling the tool and the feeding means in such a mannerthat the tool can be advanced or retracted under a relatively heavypressure, or a relatively light pressure, at the will ot the oper--ator.

Vy invention will be best understood by ret'erence to the followingspecific-ation, when taken in connection with the accompanying drawingot one illustrative `embodiment tliereo't', while its scope will loemore particularly pointed out in the appended claims.

In the drawings:

Fig. l is aside elevation, partly broken away and partly in section, ofa drilling apparatus embodying my invention;

F 2 is a sectional view on an enlarged scale. partly broken away, online 2 2 of Fig. i, looking in lthe direction ottI the arrows on saidline;

Fig. 3 is a detail sectional View on an enlarged scale on line 3 3 ofFig. 1, looking in the direction et the arrows on said line;

Fig. i is a central, vertical, longitudinal section,`partly inelevation, of the drilling tool, showing a portion of the feedingmechanism and its controlling device in elevation, parts being removedto show details of construction ,j

i* is an elevation, partly intransverse section ot a portion ot theparts shown in c'. it, as viewed from the. riglithand side thereof,certain of the parts omitted from Figa being shown in place;

F t is a sectional view on an enlarged eciiie on line 6 6 oit Fig. 1,looking toward the letti 7 a sectional view on line 7 7 of Fig. G,looking in the direction of the arrows on said line;

F 8 is u sectional view, on line 8 8 of Fig. 6, looking in the directionot' the arrows on sai-d line; i

Fig. 9 is a sectional view on line 9 9 of Fig. 6, looking in thedirection of the arrows on said line;

Fig. 10 is a plan olE the main controlling or throttle valve;

Fig. ll is a front elevation ot the controlling valve shown in Fig. 10;

Fig. l2 is a bottom plan oi the throttle valve shown in Fig. l0;

Fi 1S is an elevation of the main controlling valve viewed from theopposite side to that shown in Fig. 1l;

Fig. 14 is an elevation ot' the supplemental` controlling valve;

Fig. 15 is a sectional View on line 15-15 ot Fig. ll, looking in thedirection of the arrows on said line;

Fig. 16 is a sectional view on line 1(3 16 ot' Fig. l1, looking in thedirection ot the arrows on said line;

Fig. 17 is a sectional view on line 17 17 ot' Fig. 14, looking in thedirection of the arrows on said line;

Fig. 18 is a sectional view on line 18 18 of Fig. 14, looking in thedirection of the arrows on said line;

Figs.` 19 to 29, inclusive, are groups of detail sectional viewsillustrating the main and supplemental throttle valves in variouspositionsof adjustments, each group comprising six views, namely: a, b,c, d, e, and f', enclosed by bracket. In each group, the view a is asectional view on line ca a of Fig. 6; the view o is a sectional view online b b corresponding to line 7 7 of Fig. 6; the view c is a sectionalview on line 0 0 o't- Fig. 6; the view d is a sectional view on line dd, corresponding to line 8 8 ot Fig. (5; the view e is a sectional viewon line c e, corresponding to the line 9 9 ol Fig. 6; and the view f isa sectional view corresponding in a general way to the axial section ofthe valve in Fig. 6, viewed from the opposite direction, though in someinstances the plan ot the section is irregular, and is varied as shownby the section` lines in each figure.

Referring to the drawings, and to the embodiment of my invention which lhave selected for illustration, I have there shown a drilling apparatuscomprising a drilling tool 30, having a cylinder 31 within which apiston 32 is arranged to reciprocate This piston may actuate a suitableWorking tool in any appropriate manner, but is herein provided with areduced portion 33, constituting a hammer bar extension adapted todeliver a rapid succession ol blows upon the inner end of a drill-bitS-l held in a chuck 35 in any usual or desired manner.

The drillingl tool may ie either the valveless or valved type, but thelatter is preferred, and is provided herein with a pressure fluiddistributing valve 36, Working in a valve casing 37, the latter having apressure fluid supply space 38, from which pressure fluid under thecontrol ot' the valve is delivered to opposite ends of the cylinder, andis exhausted therefrom in any appropriate manner, which it will beunnecessary here to describe, since it forms no essential part of mypresent invention.

The cylinder is herein provided with a rear cylinder head in the form ofa headbloek 39, provided with a lgraspingA handle 40. The type of toolselected for illustration is a hand toch-that is to say. it is primarilyintended for work of the class Where it can be supported and held up toits vcorli Within the grasp of the oper-aten and the construction of thepresent apparatus is such that the drilling tool may be readily detachedand used as a separate instrument, should occasion require.

The feeding,r device may be of any suitable, character, but herein ispressure-fluid operated, and comprises a feed cylinder member 41 and afeed piston member 4Q, one of which maybe attached to a suitable supportand the other to the drilling tool. As hercin shown, the 'feed cylindermember is attached to a swivel member 43, While the feed piston memberis provided with a piston rod 44, to which the drilling tool isattached.

Preferalfily, the feeding device is doubleacting,--that is to say, it iscapable of advancing the drilling tool toward or retracting it from itswork, and to that end, the piston rod 44 is herein provided with apassage ela, leading to the rear end of the piston, and a passage 4Gleading to its front end, so that if pressure fluid be supplied to thepassage l5 only, the tool will be atvaneed; and on the other hand, ifpressure fluid be supplied to the passage 4G only, the tool will beretracted.

It should here be observed that the area upon which pressure acts toforce the piston forward is equal to the area of the pistons fullcircle, While the effective area of the forward end of the piston isequal to the area of the pistons full circle` minus the area of thepiston rod. It will thus be seen that the piston is provided withopposed di l5'- t'erential pressure areas. lf pressure lluid he suppliedto the rear area only, thc piston and the tool iarried thereby will headvanced. On the other hand, if pr fluid be supplied to the front areaonly`- the piston and tool will be retracted, the force in each carebeing,r directly prol'iortional to the arca of the :airfare acted uponby the pressure tluid. Naturally, il pref-:sure fluid be supplied to therear area only, the piston and tool will be advanced nith the maximum'feeding ellect. lf, however, appropriat'e means are provided ufherebythe operator is enabled at will to supply pressure lluid to the :frontand rear pressur* areas ot the piston .simultaneously, the latter causedto advance "with a force equal to the dill'erenec between the tivoopposed unbalanced forces acting upon thc piston. liy this means, theoperator is enabled to secure at will a feeding i'ucsfi-Jure nnichlighter or ueal-:er than the normal feeding' pressure, and the changefrom one to the other can he instantly made, as circunist'ances and thenature of the work require. These results may be, attained by the use ofcontrollingr means in the forni of two ralves, which lV will presentlydei-zcribe.

ln the particular apparatus selected 'for illustration, the drilling"tool and feeding,r mechanism are not in linea-that is to say, they arenot coaitially arranged, but it will be understood that any desiredarraagement: of these parts may be made, without depart'- ing from thespirit and scope ol. the invention as defined by the appended claims.rl`he drilling' tool ltl may he secured to the piston rod il-l; by anyappropriate means, such for example as an intermediate member a8,formingr a rigid connection therebetiveen, and serving as a easing! orhousing` for the controlling;` valve, or valves. presently described. Asherein shown. the intermediate connecting,l member provided with a presire lluid passage 'l-ll, rinuuumieatingr with the -supply space Il@ ofthe drilling' tool 3l), and passages titl and 5l. romniunieatingrespectively n'ith the passafres Ll5 and 4G in the piston rod 1t-l.rlher-c passages are herein controlled by the controlling` or throttlevalves. which l 'will nov; describe, and which coin nte one ot theprincipal features of my inventtitni.

Preferably mounted in the internnnliate connecting member -Ll-tl, is a`controllingdevice, herein in the ilorm ol a throttle iialre 52, having'capacity for eil-ordinately rontrolling: the drillinglr tool and the`leedini: mechanism. 'lhis throttle valve is lmrein provided with anaxial chamlar 53, the purpose of which will presently appear, andreceives its supply ot' presi-:ure fluid 'trom a pressure fluid inlet:fl-t, to which is connected a pressure tlnid supply ronduit 553. lhcvali' is herein provided with a slmulder fni,

lll)

llfi

QV In.

resting on a seat 57, against which it is held by a suitable spring 58,pressing against the opposite end of the valve.

As a means for turning the.` valve, the latter is herein provided withay stem 59, to which is secured a handle 60, and if desired, the valvemay be held in the selected adjust ment by a detent spring 61,cooperating with aplate 62 provided with a series of depressions orperforations G3, corresponding in number and location to the severaldefinite positions of adjustment, in which it isdesired that the valveshall be held. As a means for limiting-the turning movement of thevalve. its handle (it) herein carries a stop pin 64, which plays to andfro in a segmental slot 65, whose extent is such as to define the limitsof turning movement of the valve.

As herein shown, the valve 52 is provided with a circumferential grooveG6 forming a reduced portion or neel: 67, forming, together with agroove 68 in the member 4S, a chamber 69 to serve as a reservoir for lubricating oil which may be fed to the drilling tool and to the feedingmechanism at intervals during the operation of the apparatus under thecontrol of the throttle valve 52. in a manner which will be describedhereinafter. The chamber G9 is herein provided with an opening 70,through which it may be filled, and this opening may be closed by asuitable closure, herein in the form of a threaded plug 71.

The valve 52, which I have now described in a general way, and whichwill be described more particularly hereinafter, may be designated themain controlling valve, since it is intended to be employed directly asa means for securing the proper order of events lin the operation of themachin-e.

I will nowidescribe the preferred form of valve for permitting theoperator at will to cause pressure fluid to be supplied to both areas ofthe feed piston, whereby the latter is caused to exert a lessenedfeeding effect as compared with that which is employed when pressurefluid is supplied to the rear end only of the feed piston. This valvemay be termed a supplemental controlling valve, and is designated by thenumeral 72.

The supplemental controlling valve 72 may be otherwise suitablyconstructed and arranged, but herein is placed within the chamber 53 ofthe valve 52 concentrically with relation to the latter, and is providedwith chamber 7 3, which is directly in communication with the pressurefluid supply space 54, from which it receives the supply of pressurefluid through a suitable gauze screen or strainer 74. The valve 72 isherein provided with a shoulder 75 resting against a seat 76 formedwithin the main controlling` valve 52, and is provided with` a stem 77which extends axially through the stein 59 of the main controlling valveto a point beyond the outer end of the latter, where it is provided withav grasping handle 78. As a means for limiting the turning movement ofthe supplemental controlling valve 72, its handle 7S is herein providedy by a spring-pressed pin 8l, havingl a rounder end engaging either oftwo depressions 82 and S3 formed in the. under side of thi. graspinghandle 78, whereby the latter may be simply turned from one position ,tothe other by the application of a sunf'icient amount of force, and willbe held in the desired position of adjustment by the spring pin, untilpurposely shifted. These two positions of adjustment may be indicated byradial lines, or other suitable markings Sl and 85, and the handle 78may be provided with an arrow or indicator 8G, as shown in Fig. l. Themark or line 84 may be designated S. F., to signify strong feed, and theline 85 L. F. to indicate light feed. By plac ing these marks andidentification symbols on the parts, the operator is enabled to tell ata glance how the handle 7S should be placed to obtain the desiredresult. If desired, the grasping handle G9 may also be provided with anarrow 87, which will serve to indicate to the operator the positionwhich the main controlling'valve occupies.

The controlling valves may be otherwise suitably formed` with ports andpassages for the control of the tool and the feeding means, but I preferto employ the arrangement. of ports and passages which I will nowdescribe.

The circumferential surface of the main controlling valve 52 is hereinprovided with a segmental groove 8S, which in certain positions of themain valve establshes communication between the forward feed passage 45,59, and an exhaust port or vent 89 leading to the atmosphere (see Figs.7 and 19, particularly Fig. 19h). The circumferential surface of themain valve is also herein provided with a groove 9() having acircumferential portion 91 in the `plane fl-d, and a circumferentialportion 92 in the plane e-c connected by a portion which extendslengthwise of the valve.

When the main valve is in its Zero or neutral position, thecircumferential portion 91 of the groove 90 registers with the passages50, 45, leading to the forward feed end of the feed piston, and alsoregis ters with a port 93 leading to the atmosphere. In certainpositions of the main valve, the circumferential portion 92 of thegroove 9() registersavith the passages 5l, 46, leading to the reverse`feed`end' of the feed piston.` It should here be observed lll) that thecircumferential portion 92 ot the groove terminates in a perforation 9i,which extends entirely through the circumferential wall of the mainvalve, and in certain positions of the supplemental valve registers witha circumferential groove 95 in the latter. Reverting now to theatmospheric vent or port 93, it will be noted that its inner endterminates in a groove 96, which extends circumferentially in the wallor seat which encircles the main valve, so that during a considerableportion of the turning movement of the main Valve, the circumferentialportion 91 of the groove 90 remains in connnunieation with the ritmospheric air vent 93, as will be evident by examining the view Z in Figs.19, 20, 2l, 23, 2G and 2T. lt will now be apparent that when the mainvalve is in its Zero or neutral position, as shown in Figs. 7, 8 and i9,both ends of the feed cylinder are in communh cation with theatmosphere, whereby the feed piston may he adjusted manually without anyrestraint being imposed thereon by reason of air heilig trapped in the:feed cylinder.

The passage 50, i5, leading to the rear end of the feed cylinder, issupplied with pressure iluid to advance the tool by a port 0i' extendingentirely7 through the rircuinilercntial wall of the main valve. and inboth positions of the supplemental valve registering with a port 98extenffling entirely through the circumferential wall oil the sup"pleinental valve to the interior chamber of the latter. It should herebe observed that the port 97 is extended circumfercntially by a narrowslot 99, which at certain tmes in the operation of the machine affords arestricted port opening to the rear end of the feed cylinder (see Fig.20"). The ports 9T and 98 are also utilized at a certain time in theoperation of the machine, as hereinafter described, to establisheomn'uinieatiou between the pressure fluid supply and a port 100communicating with the `passage t9 leading to the drilling tool.

During the normal operation of the tool, the port 100 leading thereto isplaced in connnunication with the pressure fluid supply by a port 101extending through the circumferential wall of the main valve, and inboth positions of the supplemental valve registering with a port 102extending through the circunifcrential wall of the latter intocommunication with its central pressure fluid supply chamber. As a meansfor causing a very small supply of pressure fluid to be delivered to thedrilling tool to run the same slowly and Cspot the hole, the port 101 isherein circumferentiallyi elongated by a narrow slot 10?). which isadapted to register with the port 100 leading to the tool in advance ofthe main portion of the ,port 101 (see Fig. 21C). i

The port 100 leading to the tool is clon gated lengthwise of the mainand supplemental valves, and the latter, in addition to the ports 101and 102 just described, are provided respectively with ports 101i; and105, the former extending entirely through the circumferential wall ofthe main valve and the port 105 extending entirely through thecircumferential wall of the suppleinental valve. 'lhc ports '101 andlih'i are practically duplicates of the ports Atot and 102,respectively, except that the port: itl-Ll is provided with nocircumferentlal cnlargement rcorresponding to the slot 103.

The main valve is further provided with a port 10G, extending entirelythrough the circumferential wall thereof. lfn one pos tion of thesupplemental valve, this port communicates with the cireumterentialgroove 95 in the supplemental valve, while in the other position of thelatter, ths port registers with the port 10T extending entirelythroiigli the circumferential wall of the suliiplemental ialvc, wherehyin a certain position ot' the main valve (scc Fig. 2W), pressure l'luidis supplied to the rc- `verse feed or forward end of the feed c vlinder.while in another position of the main valve (Fig. 29"), pressure lluidis slipplied by way of the ports 10T and 10U to the port 100 leading tothe tool.

The main valve is provided with still another port 10hA extendingentirely through its cireum'lereniial wall, and which in both positionsof the supi'ileinenlal valve registers with a port 109 extendingentirely through the circumferential wall of the latter, and thuscommunicates with the interior chamber of the supplemental y'alve. Infour pos-itions of the main valve (sec Figs. 2th. 2:7, 2S and 299), theports 10S and 109 establish conmumitaition between the pressure fluidsupply and the reverse feed pas u elli, leading to the front end of thei'ced cylinder` whercl'iy in such position, the tool is retracteifl.

As a means for causing oil to he led lo the tool and tothe feedingmechanism under the control of the main controlling valve. the latter isherein provided with a pair of lengthwise grooiics 110 and 110cooperating with an oil pocket 112. and with a second pair of similargrooves lll, and lll. cooperating' with an oil pocket l lil. 'l`hegroove lll communicates with. and in effect forms a part of, the port9T, while the groove 110 communicates with and i'orins in ell'leet apart of the port 10i. 'lhe grooves 110' and 11i communicate at alltimes` with the oil reservoir (i9. leading directly thereto. lt shouldhere be observed that the groin'cs 110 and 111 are arranged in staggeredrelie tion with the grooves 110 amllllQ--thai to say, the ends of thegrooves lili and 111 extend bevond the ends of the grcioves Til fill

liti

lilU

110 and 111, so that a certain portion of each groove lies in a plane ta. This plane also contains the oil pockets 112 and 113.

Referring now toFig. 19a, it will be understood that the grooves 110 and111 are out of register with the oil pockets 112 and 113 respectively,while the grooves 110 and 111 are in register with said pockets,respectively. Therefore, the oil pockets at this time are incommunication with the oil chamber 69, and receive oil therefrom. lVhen,however, the main valve is turned from the position shown in Fig. 19a tothe position shown in Fig. 23a, the grooves 110 and 111 register withthe oil pockets 112 and 113, respectively, whereby the oil previouslydeposited in said pockets is allowed to flow by way of the grooves 110and 111, respectively, to the ports 97 and 101, and thence to thefeeding mechanism and tool, respectively. Then the valve is againreturned to the position shown in Fig. 19, the grooves 110 and 111lagain register with the oil pockets 112 and 113, respectively, and thesupply of oil for said pockets is replenished from the reservoir. Itwill thus be seen that, with respect to each pair of oil grooves and itsoil pocket, as the valve is turned to and fr0, said grooves are placedalternately in communication with the oil pocket, and hence a smallcharge of oil is alternately supplied to the pocket from the reservoir,and discharged from the pocket into the path of the pressure fluidentering the machine by way of the valve ports.

Having described in detail the main and supplemental controlling valves,I will now describe the general operation of the drilling apparatus, andthe various events which occur in turning the valves to their variouspositions,`reference being had to Figs. 19 to. 29, inclusive, which showseveral positions occupied by the valves in the use of the machine.

It will be remembered that the supplemental valve has two positions,with relation to the main valve. One of these rela tive positions isrepresented in Figs. 19 to 25, inclusive, and shows the supplementalvalve in such positions that pressure fluid is supplied to the rear endonly of the feed piston when the main valve is turned into such positionas to permit the feed of the pressure fiuid thereto. In the other posi'tion of the supplemental. valve with relation to the main valverepresented in Figs. 26 to 29, inclusive, pressure fluid is supplied toboth ends of the feed cylinder simultaneously, when the main valve is inthe proper position. This position is represent-ed in Fig. 27 (see viewsb and e thereof). lWith the valves thus placed, pressure fluid issupplied to both ends ofthe feed cylinder and, owing tothe differentialfront and rea-r areas of the feed piston, the latter is urged forward ata greatly reduced pressure, as compared with that which is obtained whenthe pressure fluid is supplied to the rear area only of the feed piston.

I will now describe in detail the several events which take place whilethe supplemental valve is set for a strong or heavy feed, havingreference now to Figs. 19 to 25, inclusive.

llien the main valve is placed in its zero or neutral position shown inFig. 19, the supply of pressure fluid to the ports of the feed cylinderand tool is cut oft', and both ends of the feed cylinder' are open tothe atmosphere, whereby the same may be moved freely to and fro withrelation to the feed piston, so that the preliminary adjust;

ment of the. machine may be accomplished. The inachine is then placed sothat the end of the drill-bit is against or adjacent the work, and thefeed device is contractedf-that is to say, the feed piston is adjacentthe rear end of the feed cylinder.

Having properly arranged the machineas will be readily understood bythose skilled in the art, the operator then grasps` the handle 60 andturns the same clockwise from the initial or neutra-1 position shown inFig. 19 toward the No. 1 position shown in Fig. 20. lhen the latter isreached, a limited supply of pressure fluid is admitted to the forwardfeed end of the feed cylinder by way of the ports 98, 97, groove 99, andpassages and 45 (seeFig. 20), to cause the machine to be advanced slowlyto its work, it being understood that at this time, the reverse feed endof the cylinder is open to exhaust, by ,way of the passages 46 and 51,grooves 92, 90, 91 (see Figs. 20d and 20) and atmospheric vent 93. Thefeed piston is thereby worked out gradually, until the drill-bit bringsup aga-inst its work.

Assuming the `drill-'bit now to be pressed firmly against the work, theoperator continues to turn the handle of the main valve clockwise fromthe No. 1 position shown in Fig. 20 to the No. 2 position shown in Fig.21. A full supply of pressure fluid is now admitted to the. forward feedend of the feed cylinder, the reverse feed end of the cylinder beingstill open to exhaust as before. A limited supply of pressure fluid isnow admitted to the drilling tool by way of the ports 102, 101, groove103 and passage 100 (see Fig. 21C). The size' of the groove 103 is suchas to admit at this time only a sui'cient amount of pressure fluid tooperate the drillingY tool slowly to'fspot the hole.

The hole havingbeen started, theoperator next turns the main controllingvalveto the No. 3 position shownin Fig; 22. With the valve in thisposition, the conditions alread described'in connection with the No. 2position are continued, eizcept that the pressure llnid suppl): portleading to the drilling tool is opened farther (see Fig. 22d), and thedrilling' tool receives practically its full suppl)` ot pressure lluid.In this position also the exhaust 'from the port 5l takes place throughthe port llltl, `groove 95, and port Dit to the groove 92 instead ol'vfrom the port l to the groove 92 directly. The operator continues toturn the valve from the No. Z3 position shown in Fig. 22 to the No. lposition shown in Fie'. 23, the conditions new being the saine asbefore, except that the ports leading te the drilling' tool and to theforward feed7 end o'l' the feed cylinder are now open to theirI lullextent.

The inaehine is now in tull operation, and the valve is maintained inthis position until the hole has heen drilled to the desired depth,whereupon the valve is turned contra-clockwise to its initial or neutralposition. This reversal o'l' the valve is of Course accompanied by areversal et the described order ot events, leaving' the machine with allports closed as betere.

Continuing to turn the valve eontrweloeliwise past lhe No. t) or neutralposition to the No. 5 position shown in Fig'. Q4, it will he observedthat the forward leed end of the 'feed c vlinder is opened to exhaust hyway of the passage 50, groove 8S and atmospheric vent 8S) (see Fie'.9.41)). Pressure fluid is now supplied lo the reverse leed end ol. the,leed cylinder, hv way ol the iorts 109, '108, and passage 5l (see Fig.E24-"l, thus causing the lool to he retraeted and withdrawn from thedrilled hole. Should it he desired to operate the drilling tool whilethe latter is heiliger retracted, the operator continues to turn thevalve-4 contra-clockwise from the No. 5 position shown in Fig. 2l te theNo. ll position shown in Figi', Qa. Conditions are now maintained as inthe No. 5 position,` except that pressure fluid is admitted to the toolhy way ot' the ports 98 and 97, and passage l0() (see Fie'. 25d).

The variousI positions assumed hy the main controlling valve during' theoperation ol the machine have inst heen described with reference to theposition ol the supplemental controlliinl' valre in which a, heavyv orstrong leed is maintained. Under certain Conditions of work, it isdesirable to operate the tool with the lessened feed pressure, whilestill securing' the results already deserihed in connection with theoperation of the main controlling' 'alve. To this end, I have providedthe supplemental controlling valve, whereinY what may 3e termed a lightfeed maj.' he secured at the will of the operator, hv simply turningrthe supplemental valve to the position L. F.

llelerring' now to Figs. Q6, 2T, 28 and 29, l have there shown thesupplemental coutrollingr valve in ils light feed position. llihen the.supplemental valve is so placed,

and the main controlling.;l valve in its zero or neutral position (sceFie'. Qll, the snp plv ot pressure fluid to the 'leed mechanism and thecontrolling tool is shut o ll'` and hoth ends ot' lhe Alecd o vlindi arein conununicaL lion with the almosphere. the eomlitiom` heingrpreciselj.' the same as in the zero strong feed position shown in Fig.lll.

Turning` the `valve from the r/ero position shown in Fig. (l through theinlcrreninrr positions to the No. 1l. position shown in liiu'. QT nonycauses the pressure lluid to he adA mitted to the forward il'ced end ofthe o vlinder hy wav o'l" the ports .QS and Sli' and the passage all(see Fin. ETW), as well as lo the reverse leed7 end ot the 'leedcylinder. lo.' watr ol lhc ports lili' and Alllt and the paz-isagre 105(see Fig. 27").

in this position. pressure lluid is admitted to the tool. as in the No.fl stronfr feed position shown in Fig` EIS. 'l`he drilling' tool is nowin ollieration, ort is led with a lessened degree of pressure, owingr tothe fact that pressure iluid supplied lo hoth ends ol the cylinder.:intl the ''ced piston is advanced lpiecausc oli.itsililierential areas.as hercinhciorc explained.

Turning the main controlling` ralrc l'rom 25o. .lposition shown in lirf.qQT to the ilo. .i position .shown in lire. Ltl. it will he olrf'ervedthat pressure lluid is #lill admitted to the reverse leed" end ol' lheleed cvlin der, lint is :hut ol'l" l'rom the lool. zo; well :is 'lromthe ""itorn'ard leed" end ol` the leed cylindre'. lfhen in [hisposition. the conditions` hlislnd are pracl'icallv lhe :faule as; thosee). stilleT in the No. 5 slrone leed" posiliou shown in Fin. ill. :andlhe i-onlroh line' lool is withdrawn from the work. while ont ol'operatitm.

Should il, he desired lo operate lhc lool while it is leinp' withdrawn.the valve :nur he turned trom the No. ."3 position shown iii Fre'. 2S tothe No. l position shown in Fie'. Ell, whereupon conditions arecmilnue-rl as in the No. :`i position. except [het prrssnro fluid nowadmitted to lhc tool ln.' wav ot the ports il@ and fh. and the passage'lult whereby lln` drill steel is readilv freed. should there he aiuvtendenciv lor it to stiel-1 in the drilled hole.

It should now he apparenl that h v the use ol" the deserilaid main andsupplemental controlling' valves. a veri' cifnuplcte and wide raneje ocontrol el the machine is olilaiu ahle h v a simple controllingf means.so al ranle'ed that there is no ptewiliiliti.1 whatever of the operatormatting any.' miealalae. and the desired operations take place in theirproper seunence. wil'honl an); attention on his part. other than tosimplj.v turn the han die continuously 'from one por-:ilion to an other.according lo the ci rruimusea 'lfhile l have herein shown anddeecriiifol one specific emhoilinenl` ol' mg.' invent ion l'or loo i io

Cri

illustrative purposes, and have disclosed and discussed in detail theconstruction and arrangement incidental to one specific applicationthereof, it is to be understood that the invention is limited neither tothe mere details or relative arrangement of parts noi to its specificembodiment herein shown, but that extensive deviations from theillustra-ted form or embodiment of the invention may be made Withoutdeparting from the principles thereof.`

Having thus described' my invention, what l claim and desire by LettersPatent to procure is l. Drillingl apparatus comprising in combination adrill bit; automatic drill bit rotating means; a perciissive engine:pressure fluid actuated feeding and retracting means for moving saidpercussive engine toward and away from the work` said feeding andretiaeting means being offset from but in substantialljv7 parallelrelation to said drill bit; drill bit retaining means' engaging saidpercussive engine and said drill bit and per mitting retraction of saiddrill bit When said percussive engine is retracted by said retractingmeans: and coordinately controlled pressure fluid control meanspermitting simultaneously effective operation of said'retracting meansand said `drill bit rotating means or, at the optiony of the operator,operation of said'retracting means Without operation of said drill bitrotating means.

i 2. In anappar-atus of the character described1 the combination withdrilling mechanisin` of feeding means therefor, and means forccntrolling said feeding means including a plurality of jointly movableelements one adjustable relative to theother to vary the result ofoperation thereof;

3. ln an. apparatus of the character described, the combination withdrilling mechanisn'i, of feeding means employing oppositely actingunequal forces to effect feeding movement of saidv drilling mechanism,and means for coi'itrolling said 'feeding means including a plurality ofjointly movable elements one adjustalile relative to another to vary theresult of operation thereof.

e. In an apparatus of the character describechthe combination withdrilling mechanism, :if pi' ure fiuid actuated feeding i means therefor`a main valve for controlling apparatus of the character def=t,en'lbinatiiln with drilling mechaiiism, of pressure fluid actuatedfeeding means therefor, a main valve for controllingl the admission ofpressure fluid to said feeding means, and a supple-mental valve carriedby and movable with said main Valve but adjustable relative thereto tovary the effect of operation of thela-tter, said supple- -iental valvein different positions causing operation of said main valve to producedifferent feeding thrusts of said feeding means.

(l. In an apparatus of the character described, tlie combination withdrillingmec-hanism, of pressure fluid actuated feeding means therefor,said feeding means comprising` a cylinder and a piston therein havingdifferential areas, and means including a plurality of jointly movableelements for controlling the admission of pressure fluid to said feedingmeans, one of said elements being adjustable relative to the other tocause operationof the latter to admit pressure fluid to one side of saidpiston or to cause asimilar operation thereof to admit pressure fluid toboth sides of said piston.

7. In an apparatus of thel character described` the combination withdrillingmechanisiii, of feeding means employing` oppositely actingunequal forces to effect feeding movement of said drilling` mechanism,and meansifor conjointly controlling said drilling mechanism and feedingmeans including a plurality of elements one movable with the other andadjustable relative thereto to cause operation of the latter to produceapplication of one of said unequal forces or to cause a similaroperation thereof to produce appli- 'ation of both of said forces.

8. In an apparatus of the character 4described, the combinationwitli'pressure fluid actuated drilling mechanism, of pressure fluidactuated' feeding means therefor` a main valve for conjointlycontrolling the admission of pressure fluid to said drilling mechanismand feedingl means, and a supplemental valve for varying the floiv offluid through said main valve, said supplemental valve in one positioncausing operation of said main valve to produce a strong feeding thrustof said feeding means and in another position causing a similaroperation of said main valve to produce a light feeding thrust of saidfeeding means.

The combination with a pressure fluid motor and pressure fluid feedingmeans therefor, of tivo valves one valve having means for conjointlycontrollingr said motor and feeding means and the other having means forcausing said feeding means to oplerate at a plurality of predeterminedeffective pressures, and means whereby said last mentioned valve maymove with said first mentioned valve during a portion of the operationthereof.

10. The combination with a pressure fluid motor andl pressure fluidfeeding means therefor, of two valves one valve havin,r means forconjoint-ly controlling said motor and 'feeding means and the otherhaving means for causing said feeding means to operate at a plurality ofpredetermined el'leetive pressures, and means .vhereliy said lastmentioned valve may move with said first mentioned valve during` aportion of the operation thereof or whereby said last mentioned valvemay be adjusted relative to said first mentioned valve.

ll. The combination with a pressure fluid motor and pressui'e [luidfeeding means therefor, of two valves one valve having; means foreonjoiutly controlling said motor and feeding means and the other havingmeans for causing said feeding means to operate at a plurality ofrnfedetermined effective pressures, and means whereby during apredetermined operar-.tion of said first mentioned valve said lastmentioned valve may move therewith or whereby said last mentioned valvemay he adjusted relative to said first mentioned valve and thereaftermove therewith.

lf2. rl`he eombiilation '-.vith a pressure fluid motor and pressurefluid feeding means therefor, of two valves one valve having means foreonjointly controlling said motor and feeding means and the other havingmeans for ausingnY said feeding means to operate at a plurality ofpret'leterrnined eli'ec tive pressures, and operative connectionsbetween said valves whereby one may be adjusted relative to the otherand the two 'alves thereafter operated simultaneously.

lll. The combination with a pressure fluid motor and pressure fluidfeeding means therefor, of controlling' mechanism ineluding` a valveoperative in its different positions to ad fanee the motor to the work,operate the same slowly, and subsequently more rapidly, and cooperatinglcontrolling,` mechanism moval'ile therewith and adjustable relativethereto to vary the feeding,r effect.

fel. The combination with a pressure fluid motor and pressure fluidfeeding means therefor, of controlling mechanism ineludiner a valveoperative in its different positions to advance the motor to the work,operate the same slowly, and subsequently more rapidly, and thereafterreverse the feed. and eo-operatiiur Controlling meehanis-ni movabletherewith and adjustable relative thereto lo `ary the feedimgr efl'ect.

l5. The combination with a pressure fluid motor and pressure fluidfeeding' means therefor, of controlling' mechanism ineluding a valveoperative in its different positions to advance the motor to the work,operate the same slowly, and subsequently more rayrdly, and thereafterreverse the feed while operating the motor, and Cooperating:rcontrolling meehanisi'n movable therewith and :u'liuslzhle relativethereto lo vary the feeding efleet.

ltf. 'lhe Combination with a pressure fluid motor, pressure fluidfeedingr meehanism, and lubricating means therefor, of controlling'mechanism .including a valve operative in its different positions toadvanee the motor toward the worlt, operate the same slowly and subsepiently more rapidly, and duringr the operation o'l': the nieehauisin supply luln'icant thereto, and cooperating controllinl nieehanisin movabletherewith and adjustable relative thereto to vary the feed-- im.;leffect.

li. rl. pressure [luid feed mechanism oomprising', in (annbination, aeyliuder:` a piston therein havingl differential areas; and a pluralityol eoneeulrically arranged valves having' one relative position in whichpres sure fluid is supplied lo both arcas of said piston and anotherrelative position in which pressure fluid is supplied to one area onlyofl said piston.

lt). A prevsure fluid feed mechanism comprisint, in combination, aeylinder; a pistou therein havilu,r differential areas; and a lluralityof coueentrieally arranged valves havingr a common fluid supply andprovided with ports whirh in one relative position of' said valves causepressure fluid to be supplied to both areas of said piston and inanother relative position cause pressure fluid to be supplied to onearea only of said piston.

19. The eon'ibination with a pressure fluid motor and pressure fluidfeeding means therefor: of means for conjointly control ling said motorand feeding means; and eoordinately controlled means movable therewithand controllingr fluid pressures upon opposed surfaces of differentareas to vary the effective thrust ol said feeding,r means.

Q0. The combination with a pressure fluid motor and pressure fluidfeeding means therefor; of means for eonjointly controlling said motorand feeding means; and eoordinately controlled means movable therewithand adjustable relative thereto and controlling oppositely acting;rforces at will to vary the effective thrust of said 'feeding means.

2l. The combination with a pressure fluid motor and pressure fluidfeeding,r means therefor; ot' a valve 'for eoiriointly eontrolling saidmotor and feeding means. and another but eoordinal'ely controlled valvecon trolling oppositely aeting forces lfor eausing said feeding,r meansto operate at a plurality of pret'leterinined effective pressures.

22. The combination with a pressure fluid motor and pressure fluidfeeding means therefor; of two valves, one carried by the other, onevalve having means for conjointly controlling said motor and feeding ltl means, and the other having means for causing said feeding means tooperate at a plurality of predetermined effective pressures.

23. The combination With a pressure fluid motor and pressure fluidfeeding means therefor; of main controlling means having one position inWhich pressure fluid is admitted to said feeding means but eX- cludedfrom said motor, and another position in which fluid is admitted to saidfeeding means and said motor, and supplemental but coordinatelycontrolled pressure fluid controlling means movable therewith and havinga plurality of positions in Which said feeding means is renderedeffective to produce different degrees of thrust.

24. The combination with a pressure fluid motor and pressure fluidfeeding means therefor; of main controlling means having one position inWhich pressure fluid is admitted to said 'feeding means but eX- cludedfrom said motor, and another position in which fluid is admitted to saidfeeding means and said motor, and supplemental controlling means carriedby said main controlling means and having a plurality of positions inWhich said feeding means is rendered effective to produce differentdegrees of thrust.

25. The combina-tion with a pressure fluid motor and pressure fluidfeeding means therefor; of a main controlling valve having one positionin which pressure fluid is admitted to said feeding means but excludedfrom said motor, and another position in which fluid is admitted to saidfeeding means and said motor, and a supplemental controlling valvearranged concentrically with relation to and carried by said maincontrolling valve and having a plurality of positions in Which saidfeeding means is rendered effective to produce different degrees ofthrust.

26. In a drilling mechanism, a rock drill, and feeding means thereforcomprising relatively reciprocable cylinder and piston elements, oneoperatively connected to said drill and the other adapted to be heldstationary during drilling, means to cause said elements to. effectforward feed of said rock drill including a ported valve chamber,conduit means connecting the same Wih the interior of said cylinder, aported valve member in said chamber, a fluid supply connection openinginto the end of said chamber, and auxiliary valve means operativelyconnected to said valve member interposed between said fluid supplyconnection and said conduit means for controlling fluid flow throughsaid valve member.

27. In a drilling mechanism, a rock drill, and feeding means thereforcomprising relatively reciprocable cylinder and piston elements, oneoperatively connected to said drill and the other adapted to be heldstationary during drilling, means to cause said elements to provide afeeding force of variable intensity comprising a plurality of coaxiallyarranged valves controlling the supply of operating fluid to saidelements, and operating means therefor including an element operative onmovement to cause simultaneous movement of said valves and an elementoperative on movement to move one of said valves relative to the other.

28. In a rock drilling apparatus, a drilling motor, and feeding meanstherefor comprising relatively movable cylinder and piston elements, oneoperatively connected to said motor and the other held stationary duringfeeding, and controlling means for said nio-- tor and feeding meansincluding a plurality of coaxially arranged valves, one of which isrotatable to control the timing of the iuitiation of feed and motoroperation and the other of Which is movable to control the force of thefeed.

29. In a rock drilling apparatus, the combination With a plurality ofWork performing members, one of Which comprises a feeding mechanism, ofmeans for controlling both of said members, and means for controllingone of said members operatively connected to said other means.

30. In a rock drilling mechanism, the combination With a plurality ofWork performing members, one of which comprises a feeding mechanism, ofmeans for controlling both of said members, and means for controllingone of said members operatively connected to said other means andoperable independently of the latter.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

